Drill device



Mardi 9 F. A( VEBTH DRILL DEVIGE Filed Jan. 3l, 1921 Patented Mar. 9, 33.92%.,

E WITH, 0F ERIE, PENNSYLVANIA, ASSIGNOR TO TITAN TOOL COMPANY, OF

ERIE, PENNSYLVANIA, A COREORATION OF' PENNSYLVANIA.

13mm. nemen.

Application filed .Tanner-y $31, 1921. Serial No. 441,233.

To all 'whom it may concern:

Be it knovvn that l', FRANK A. Vnrru, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania., have invented new and useful Improvements in Drill Devices, of which the followingF is a specification.

It is desirable to provide a drill chuck with means by whichthe drill may be positively driven, accurately centered and readily changed. My invention accomplishes these objects.- In carrying it out l provide a collet which is locked in the chuck socket by a key device, the key device being locked by a cam sleeve. rlhe sleeve is conveniently locked against removal from the chuck. lt is also desirable to yieldingly hold this sleeve in locking position so that the drill chuck may be inverted lwithout a disengaging'movement of the sleeve.`

The invention is illustrated in the accompanying drawings as follows:

Fig. l shows a drill chuck, partly in section, on the line l--l in Fig. 3.

Fig. 2 a side elevation of the chuck.

Fig. 3 a section on the lino 3-3 in Fig. 1.

l marks the chuck`r 2 the chuck shank` 3 the chuck socket, 4 a collet arranged to operate in the chuck socket. 5 a drill arranged in the collet, a tang: of the drill extending through the end of the collet, li a ball socket arranged in the collet. and 7 a ball arranged -in a perforation 8 in the walls of the chuck, the perforation having the usual reduced diameter at its inner end to retain the ball when the collet is removed.

A locking sleeve 9 is slilinjrl'y mounted on the outer surface of the*y chuck. lt has a locking surface l0 which 'is practically the saine diameter as the outer' surface of the chuck and which is adapted to hold the halls in the inward or locking position in the ball socket 6. The sleeve is provided with a cam ll which operates to :force the balls inwardly when the sleeve is moved axially and is also provided with the recess having' the outer surface l2 which permits the balls to move outwardly suiiiciently. to .release the collet.

A snap ring 13 is arranged in a groove snap ring' forms a locking device Which prevents the sleeve from slipping oil the chuck. lt engages the cam surface 11 at one end ol' the recess and a shoulder 15 at the opposite end. In this Way the locking device is entirely housed by the sleeve. lt can bc very readily assembled and conveniently ac complishes the purpose.

I prefer to provide a spring 1G which is also housed in the recess and tends to hold the sleeve with the cam surface 1l in engagement With the ring". in other Words, hold the sleeve in position to hold the balls in locking position. This spring is preferably il'ornxed integrally with the snap ring' 1B be! ing formed simply in continuation of it, thc end of the ring having a slight off-set 17 to carry it out of the groove l-l and it is then continued with a winding having a coil spring pitch.

What l claim as new iszl. ln a drill device, the combination of a chuck having a tool socket and a snap ring groove in its outer surface; a key device operating through the Wall of the chuck;

an operatingb sleefe slidingly mounted 0114 the chuck and having a locking surface operating: on the key device; a cam operating on the key device and an annular recess; a snap ringr in the groove and recess; and a spring 'operating against the snap ring and a wall of the recess and yieldingly hold ing the sleeve in locking position, .said spring being formed integrally with the snap ring.

2. ln a drill device, the combinationof ay` chuck having a tool socket and a snap ring groove on its outer surface; a key device o'perating through the Wall of the chuck'; an operating sleeve slidingly mounted on the chuck and having a cam operating on the key device and. a holding surface operating' on the key device, a snap ring in the groove for locking the sleeve against movement in one direction; and a spring formed integrally With the snap ring and yieldingly holdingr the sleeve in locking position.

In testimony whereof I have hereunto set my hand.

FRANK A, VEITH. 

